- Plymouth Area League of Women Voters
- The Open Space Committee
- Plymouth Center Steering Committee
- Sierra Club
- Surfrider Foundation
- Network of Open Space Friends
- Herring Pond Watershed Association
- Six Ponds Improvement Association
- Sustainable Plymouth
- Sustainable Pinehills
- Sustainable Redbrook
- Southeastern Massachusetts Pine Barrens Alliance
- Friends of Myles Standish Forest
- Whale and Dolphin Conservation
